List - I		List - II
a)	Spherical wave front	e)	Location of new wave front
b)	Plane wave front	f)	Line source
c)	Cylindrical wave front	g)	point source at finite distance
d)	Huygen’s principle	h)	Point source at infinite distance

	(a)	(b)	(c)	(d)
1)	g	h	f	e
2)	h	g	f	e
3)	h	g	e	f
4)	g	e	f	h

SPHERICAL WAVEFRONT:
When the point source is an isotropic medium, sending out waves in three dimensions, the wavefronts are spheres centered on the source.

Examples of Spherical Wavefronts
Electromagnetic waves in a vacuum form a spherical wavefront.
The concentric circles' formation when the stone is dropped in a water.
An army man patrolling the opposition on the radar through the camera positions the invader with the spherical wavefront symbol.

CYLINDRICAL WAVEFRONT:
In a cylindrical wavefront, all the points equidistant from the linear source lie on the surface of a cylinder, as shown in the figure. The cylindrical wavefront appears like a cylinder. However, if we draw the wavefront from one plane, we obtain a concentric circle like a spherical wavefront.Example of Cylindrical WavefrontWhen rays of light coming out of a lens fall on another lens, they converge at a given point. As they bend and converge at a point, it takes the form of a cylinder.

PLANE WAVEFRONT:

The wavefront will appear as a plane when viewed from a considerable distance from a source of any kind. Such a wavefront is called a plane wavefront. Moreover, the plane wavefront is obtained when the small part of the spherical or cylindrical wavefront originates from a distant source, like infinity. Example sun.